Condensed Consolidating Financial Statements - Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	$ 32,365	$ 24,402	$ (6,746)
Investing activities:
Capital expenditures	(20,469)	(22,232)	(32,147)
Acquisitions, net of cash received	2,892	0	0
Change in restricted cash	1,802	11,509	4,047
Proceeds from sale of assets	971	4,788	2,847
Proceeds from sale of discontinued operations	0	9,564	0
Net cash provided by (used in) investing activities	(20,588)	3,629	(25,253)
Financing activities:
Proceeds from revolving line of credit	10,000	42,340	21,000
Payments of revolving line of credit	(9,600)	(27,342)	(2,551)
Deferred acquisition payments	(3,000)	(19,527)	(21,977)
Payment of long-term debt	(481)	(21,733)	(3,599)
Proceeds from exercise of stock options	0	24	250
Purchase of treasury stock	(722)	(630)	0
Net cash provided by (used in) financing activities	(3,803)	(26,868)	(6,877)
Net increase (decrease) in cash and cash equivalents	7,974	1,163	(38,876)
Effect of foreign currency fluctuations on cash	668	(2,730)	827
Cash and cash equivalents at beginning of fiscal year	56,362	57,929	95,978
Cash and cash equivalents at end of fiscal year	65,004	56,362	57,929
Parent
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	3,722	39,575	7,724
Investing activities:
Capital expenditures	0	0	0
Acquisitions, net of cash received	0
Change in restricted cash	0	0	0
Proceeds from sale of assets	0	0	0
Proceeds from sale of discontinued operations		0
Net cash provided by (used in) investing activities	0	0	0
Financing activities:
Proceeds from revolving line of credit	0	0	0
Payments of revolving line of credit	0	0	0
Deferred acquisition payments	(3,000)	(18,527)	(20,977)
Payment of long-term debt	0	(20,417)	(3,583)
Proceeds from exercise of stock options	0	24	250
Purchase of treasury stock	(722)	(630)
Net cash provided by (used in) financing activities	(3,722)	(39,550)	(24,310)
Net increase (decrease) in cash and cash equivalents	0	25	(16,586)
Effect of foreign currency fluctuations on cash	0	(1)	0
Cash and cash equivalents at beginning of fiscal year	640	616	17,202
Cash and cash equivalents at end of fiscal year	640	640	616
Guarantor Subsidiaries
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	15,107	(4,085)	(26,984)
Investing activities:
Capital expenditures	(9,550)	(12,930)	(13,348)
Acquisitions, net of cash received	2,892
Change in restricted cash	1,802	11,509	4,047
Proceeds from sale of assets	248	2,403	996
Proceeds from sale of discontinued operations		0
Net cash provided by (used in) investing activities	(10,392)	982	(8,305)
Financing activities:
Proceeds from revolving line of credit	8,000	37,340	9,000
Payments of revolving line of credit	(9,600)	(22,342)	(2,551)
Deferred acquisition payments	0	(1,000)	(1,000)
Payment of long-term debt	0	0	(16)
Proceeds from exercise of stock options	0	0	0
Purchase of treasury stock	0	0
Net cash provided by (used in) financing activities	(1,600)	13,998	5,433
Net increase (decrease) in cash and cash equivalents	3,115	10,895	(29,856)
Effect of foreign currency fluctuations on cash	0	(1)	0
Cash and cash equivalents at beginning of fiscal year	33,094	22,200	52,056
Cash and cash equivalents at end of fiscal year	36,209	33,094	22,200
Non-Guarantor Subsidiaries
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	13,536	(11,088)	12,514
Investing activities:
Capital expenditures	(10,919)	(9,302)	(18,799)
Acquisitions, net of cash received	0
Change in restricted cash	0	0	0
Proceeds from sale of assets	723	2,385	1,851
Proceeds from sale of discontinued operations		9,564
Net cash provided by (used in) investing activities	(10,196)	2,647	(16,948)
Financing activities:
Proceeds from revolving line of credit	2,000	5,000	12,000
Payments of revolving line of credit	0	(5,000)	0
Deferred acquisition payments	0	0	0
Payment of long-term debt	(481)	(1,316)	0
Proceeds from exercise of stock options	0	0	0
Purchase of treasury stock	0	0
Net cash provided by (used in) financing activities	1,519	(1,316)	12,000
Net increase (decrease) in cash and cash equivalents	4,859	(9,757)	7,566
Effect of foreign currency fluctuations on cash	668	(2,728)	827
Cash and cash equivalents at beginning of fiscal year	22,628	35,113	26,720
Cash and cash equivalents at end of fiscal year	28,155	22,628	35,113
Reclassifications and Eliminations
Sources (uses) of cash and cash equivalents
Net cash provided by (used in) operating activities	0	0	0
Investing activities:
Capital expenditures	0	0	0
Acquisitions, net of cash received	0
Change in restricted cash	0	0	0
Proceeds from sale of assets	0	0	0
Proceeds from sale of discontinued operations		0
Net cash provided by (used in) investing activities	0	0	0
Financing activities:
Proceeds from revolving line of credit	0	0	0
Payments of revolving line of credit	0	0	0
Deferred acquisition payments	0	0	0
Payment of long-term debt	0	0	0
Proceeds from exercise of stock options	0	0	0
Purchase of treasury stock	0	0
Net cash provided by (used in) financing activities	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Effect of foreign currency fluctuations on cash	0	0	0
Cash and cash equivalents at beginning of fiscal year	0	0	0
Cash and cash equivalents at end of fiscal year	$ 0	$ 0	$ 0